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TUSB1044: Please review the schematic and artwork.

Chase Jeong
Mastermind 7485 points
Part Number: TUSB1044
Other Parts Discussed in Thread: TUSB211

Hello TI experts,

my customer drew 1st schematic using TUSB1044.

could you review the schematic and artwork?

and here is the question from the customer.

1. in the schematic, the folw of usb 2.0 signal is from host connector(J6) -> USB mux(U12) -> USB conditioner(U13) -> to target side connector(J1). is it right sequence? or should we change the sequence of U12 and U13?

2. how should we set DIR[1:0], FLIP and SWAP pin if the direction is fixed?
(ex. only J6 to J1 / or only J1 to J6)

3. we do not consider using of display port but we routed just in case. (AUXP(N), SBU1(2))
but if there are any bad effects to other signals like USB3, we are going to remove these routings. please check this point.

4. as the same view of no.3, we connected CTL1 and HPDIN to GND (not using display port) please also check it.

i attach the schematic and *brd artwork file for your convenience. Thanks.

schematic_001.pdf

artwork_001.brd

Best regards,
Chase

  • 0
    TI__Guru 64326 points

    Hi Chase,

    I will review the shcematic and layout. Please give 1-2 days for feedback. Could you give some more details on the application?

    1. Current configuration is okay.

    2. These pins can have static resistor configurations.

    3.AUX and SBU signals should not impact the USB3 if there is no communication. I will check the routing on this point to confirm.

    4. There is not issue here connecting these pins to GND. I would recommend using a 1k resistor option instead of a direct short. 

  • 0 in reply to Malik Barton57
    Mastermind 7485 points

    Hi Malik,

    Thank you for your support.

    Actually this is for the security of USB drive. user can control the connection of host and target through BLE application, only authorized user can change the configuration of connection.

    and I need more information for the answer of no.2, where should I refer from the datasheet?

    and please let me know if you have any questions. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 64326 points

    Hi Chase,

    You can refer to section 7.3.3 4-level Inputs. FLIP will need to be controlled by the PD controller for Type-C applications. 

  • 0 in reply to Malik Barton57
    Mastermind 7485 points

    Hi Malik,

    Thank you for your support.

    Here are another request from customer about review the schematic and artwork.

    4. There is not issue here connecting these pins to GND. I would recommend using a 1k resistor option instead of a direct short.

    -> they said that they do not have enough space to insert 1kohm resistor. can we connect these pins to GND directly? what is expected side effect?

    and another question;

    The GND plane (L2) in the artwork, there is wide chassis ground(CH_GND) for  ESD performance, and small GND for TUSB1044 and TUSB211. they worried about it, please also review about GND plane. (for example, it would be better to make larger GND for TUSB1044..)

    please check these issues. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 64326 points

    PD resistor would only limit the output current through the pin. Also your design has two USB-C receptacles. USB-C spec does not allow devices with receptacles on both sides. A USB receptacle should present its own termination on the CC pins. If you are making a pass through board you will need to change one connector to a USB-C plug. Flip will need to be controlled manual or by CC/PD controller.

    GND planes should be tied together TUSB1044 needs more copper for thermal purposes. You should put GND voids under AC cap pads to reduce patristics. 

    schematic_001_reviewed.pdf

  • 0 in reply to Malik Barton57
    Mastermind 7485 points

    Hi Malik,

    Thank you for your support.

    I have few question about your answer ;

    1. could you point clearly what PD resistor is? I cannot find it on schematic.

    2. How can I control FLIP pin manually? because we have only one purpose, we will not use CC controller.

    3. what is the exact meaning of patristics?

    and here is one more question,

    I cannot see the reset pin in TUSB1044. I can see only SOFT_RESET register.

    could you guide me about hardware reset?

    and please send me your review result about artwork when you've done.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 64326 points

    Hi Chase,

    1. PD resistor would be the pull-down resistor on various configurations pin. They do not exist in the schematic right now. 

    2. There is no good solution to control FLIP manually with minimal components, this pin is intended to be controlled by the PD/CC controller.

    3. I am referring to the parasitic capacitance caused from the GND underneath the pads of the AC coupling caps.

    SLP_S0# pin will be the closest function to a power-on reset. My only comment on the artwork are listed below for the TUSB1044 portion. 

    GND planes should be tied together TUSB1044 needs more copper for thermal purposes. You should put GND voids under AC cap pads to reduce patristics. 

  • 0 in reply to Malik Barton57
    Mastermind 7485 points

    Hi Malik,

    Thank you for your support.

    customer modified lots of points based on your advice.

    still I have questions. could you check it?

    1. It seems that I can disable only RX detect function through SLP_S0# pin. and it's not possible to reset this device when something is badly wrong. am I right?

    2. about FLIP pin, customer cannot use additional chipset because the PCB is very small. instead they want to control through GPIO of MCU. is there any reference about it? (the way to make CC/FLIP control using firmware)

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 64326 points

    Hi Chase,

    1. This is correct however if the RX detect is disabled. However this will disable the link and allow it to not restart. (RX detect is the first step in USN link training.)

    2. This is possible if MCU also monitors CC pins in accordance with USB-C spec. However you will not find reference code through TI for this application.